kopia lustrzana https://github.com/espressif/esp-idf
64 wiersze
3.0 KiB
C
64 wiersze
3.0 KiB
C
/*
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* SPDX-FileCopyrightText: 2019-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdint.h>
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#include "hal/adc_types.h"
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#include "../curve_fitting_coefficients.h"
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#define COEFF_GROUP_NUM 4
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#define TERM_MAX 5
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/**
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* @note Error Calculation
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* Coefficients for calculating the reading voltage error.
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* Four sets of coefficients for atten0 ~ atten3 respectively.
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*
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* For each item, first element is the Coefficient, second element is the Multiple. (Coefficient / Multiple) is the real coefficient.
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*
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* @note {0,0} stands for unused item
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* @note In case of the overflow, these coefficients are recorded as Absolute Value
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* @note For atten0 ~ 2, error = (K0 * X^0) + (K1 * X^1) + (K2 * X^2); For atten3, error = (K0 * X^0) + (K1 * X^1) + (K2 * X^2) + (K3 * X^3) + (K4 * X^4);
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* @note Above formula is rewritten from the original documentation, please note that the coefficients are re-ordered.
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*/
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const static uint64_t adc1_error_coef_atten[COEFF_GROUP_NUM][TERM_MAX][2] = {
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{{27856531419538344, 1e16}, {50871540569528, 1e16}, {9798249589, 1e15}, {0, 0}, {0, 0}}, //ADC1 atten0
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{{29831022915028695, 1e16}, {49393185868806, 1e16}, {101379430548, 1e16}, {0, 0}, {0, 0}}, //ADC1 atten1
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{{23285545746296417, 1e16}, {147640181047414, 1e16}, {208385525314, 1e16}, {0, 0}, {0, 0}}, //ADC1 atten2
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{{644403418269478, 1e15}, {644334888647536, 1e16}, {1297891447611, 1e16}, {70769718, 1e15}, {13515, 1e15}} //ADC1 atten3
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};
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const static uint64_t adc2_error_coef_atten[COEFF_GROUP_NUM][TERM_MAX][2] = {
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{{25668651654328927, 1e16}, {1353548869615, 1e16}, {36615265189, 1e16}, {0, 0}, {0, 0}}, //ADC2 atten0
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{{23690184690298404, 1e16}, {66319894226185, 1e16}, {118964995959, 1e16}, {0, 0}, {0, 0}}, //ADC2 atten1
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{{9452499397020617, 1e16}, {200996773954387, 1e16}, {259011467956, 1e16}, {0, 0}, {0, 0}}, //ADC2 atten2
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{{12247719764336924, 1e16}, {755717904943462, 1e16}, {1478791187119, 1e16}, {79672528, 1e15}, {15038, 1e15}} //ADC2 atten3
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};
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/**
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* Term sign
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*/
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const static int32_t adc1_error_sign[COEFF_GROUP_NUM][TERM_MAX] = {
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{-1, -1, 1, 0, 0}, //ADC1 atten0
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{-1, -1, 1, 0, 0}, //ADC1 atten1
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{-1, -1, 1, 0, 0}, //ADC1 atten2
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{-1, -1, 1, -1, 1} //ADC1 atten3
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};
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const static int32_t adc2_error_sign[COEFF_GROUP_NUM][TERM_MAX] = {
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{-1, 1, 1, 0, 0}, //ADC2 atten0
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{-1, -1, 1, 0, 0}, //ADC2 atten1
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{-1, -1, 1, 0, 0}, //ADC2 atten2
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{ 1, -1, 1, -1, 1} //ADC2 atten3
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};
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void curve_fitting_get_second_step_coeff(const adc_cali_curve_fitting_config_t *config, cali_chars_second_step_t *ctx)
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{
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ctx->term_num = (config->atten == 3) ? 5 : 3;
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ctx->coeff = config->unit_id == ADC_UNIT_1 ?
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adc1_error_coef_atten[config->atten] :
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adc2_error_coef_atten[config->atten];
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ctx->sign = config->unit_id == ADC_UNIT_1 ?
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adc1_error_sign[config->atten] :
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adc2_error_sign[config->atten];
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}
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